What is the circumference of a circle if the diameter is 12 in

 

The circumference (in terms of "π") is:  " 12π  in. " .

The circumference (using "3.14" as an approximation for "π") is: " 37.7 in. " .


Circumference, "C" = π* d ; (d = diameter = 12 in.); 

C = π* d = π * 12 in. = " 12π  in. "  (in terms of "π").

Or, using the approximation, "π ≈ 3.14" ;

C = 3.14 * (12 in.) = 37.68 inches ; round to:  " 37.7 in. " .
 

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